The expansion clamp and lens adapter are the key extension accessories of the SeaTouch 4 Max housing for underwater photography. Multiple ways of mount are integrated in one single clamp, including different specification thread M6 and 1/4” to adapt various kind of underwater photography accessories. Cold shoe connector is integrated to fit more gears. With adjustable length lens adapter, you can attach wet lenses, filters, tray and lights on the housing, to fully equip your housing for different underwater scenarios.